Home / 1,429.28-2,143.90-389.26

Finding the Fourth Proportional to 1,429.28, 2,143.90 and 389.26

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Solution

The fourth proportional to 1,429.28, 2,143.90 and 389.26 is: 583.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.28 : 2,143.90 = 389.26 : x
  2. Step 2: Convert to fraction form
    1,429.28/2,143.90 = 389.26/x
  3. Step 3: Cross multiply
    1,429.28x = 2,143.90 × 389.26
  4. Step 4: Simplify right side
    1,429.28x = 834,532.57
  5. Step 5: Solve for x
    x = 834,532.57/1,429.28
  6. Step 6: Final answer
    x = 583.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.